On Wed, Jun 18, 2014 at 10:18:54AM -0500, SH Development wrote:
> I have a customer that is claiming that their customers are
> getting emails without the attachments.
Anecdotal claims are useless. Some evidence needs to be presented
that the attachment was removed en-route.
> I can see in the log that the receiving server has accepted the
> message, and the message size indicates there is "something"
> attached.
Are you a relay in front of the customer's MTA, or the mailbox
provider?
> We do have a size limit set of 20MB, but usually when something
> is too big, it just bounces it, not drop the attachment, so I don't
> think it's a size issue.
Postfix has no code to discard attachments. You'd have to do that
with a milter or content_filter.
> Ideas?
You've not learned how to ask meaningful questions. Without any
evidence in the form of logs for and headers of a message that is
alleged to have lost an attachment en-route, nothing useful can be
said beyond the observation that Postfix delivers complete messages,
and does not have any built-in facilities for removing individual
attachments.
If the problem is reproducible, arrange to capture a PCAP file of
an inbound cleartext transmission of the message, or to freeze it
in the hold queue without any processing by milters or content
filters. Then determine whether the attachment is initially present.
Similarly capture cleartext outbound transmission, or divert outbound
transmission to an intermediate relay where the output message can
be compared with the input.
--
Viktor.
